@djscruffy: In defense of public schools, I would suggest that the reason many of these books are challenged so often is that they're frequently included in school curriculums and libraries. I grew up in a state that, according to these links, engaged in book-burning less than a decade before my birth. That makes me shudder. But I'm also the child of a public school teacher and am familiar with my mother's and many of her peers' views on children's reading materials.